When working on intermittent electrical faults, it can be especially handy to have a helper around to help watch things and provide feedback while you are in another area wiggling wires and hunting for potential electrical shorts. In reality though, even in large shops, it can be difficult to find someone with the time to spare for such adventure.
Enter the world of high tech electronics...
Photo Credit - http://www.flickr.com/photos/dgbury/
Now, with a laptop, USB extension cable, and a webcam, you can be in two places at once. USB extension cables (male on one end and female on the other) can easily be purchased in 3', 6', and even 10' lengths. A long cable will allow you to place your extra "eyes" on one end of the vehicle while you work on the other. Keep in mind though that not all USB webcams will support the use of an extension cable, so, you may have to experiment a little with this if it's necessary to go beyond the standard cable length. A signal delay factor limits USB 2.0 USB cable length to 5 meters, or about 16 feet. If your camera comes with a 6 foot cable, that may be enough length for most situations. If your particular set-up allows it, you may be able to stretch your camera to the sixteen feet limit by using a ten foot extension cable.